Leases - Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Lease, Cost [Abstract]
Operating lease costs	$ 2,171	$ 1,704
Amortization of assets	75	311
Interest on lease liabilities	3	16
Total finance lease costs	78	327
Variable lease cost	518	406
Short-term lease costs	354	38
Total lease costs	$ 3,121	$ 2,475